Found it... It's not immediate unless passed as a pointer with: {attribute 'VAR_IN_OUT_AS_POINTER'}
So I've started playing with dialogs, but am getting a bit frustrated as I can't seem to get them to work with my VAR_IN_OUT. Essentially, the dialog is has a start, Stop and Close button. And the interface to the visualisation is a UDT with Start, Stop and Running. I placed the button action to toggle variable and these appear available so I linked them, but when operating the button, it really doesn't do anything to the variables. Any idea what I may be doing wrong, here?
Fantastic!! Thanks!!!
Care to point me in the direction of any information on how to create pop ups?